what means callback function code example

Example 1: callback function

function createQuote(quote, callback){ 
  var myQuote = "Like I always say, " + quote;
  callback(myQuote); // 2
}

function logQuote(quote){
  console.log(quote);
}

createQuote("eat your vegetables!", logQuote); // 1

// Result in console: 
// Like I always say, eat your vegetables!

Example 2: callback function

const ironMan = withGloves(withBoots(withArmor(withHelmet(TonyStark))));